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In a transformer when we pass current I at a voltage V, it induces current I' in secondary coil at some V' . Here the VI=V'I'. Now I am confused that in a way is energy not being "created"(which is...

Is it just like diffusion gradient which results in osmosis or is it something else? Moreover also when we go accroding to ohm's law current is directly propertional to potential difference, but our...

I want to know what electricity actually is? Is it flow of electrons or they just vibrate and pass on the enrgy and if its so what's the need of free electrons? And is the a surface phenomenon or a...